|本期目录/Table of Contents|

[1]李超,孙克克,陈斌.辽东营口—辽阳地区古元古代花岗岩和变质基性岩形成时代及意义[J].地球科学与环境学报,2017,39(02):143-160.
　LI Chao,SUN Ke-ke,CHEN Bin.Paleoproterozoic Granites and Meta-mafic Rocks from Yingkou-Liaoyang Area of the Eastern Liaoning and Their Significance[J].Journal of Earth Sciences and Environment,2017,39(02):143-160.
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辽东营口—辽阳地区古元古代花岗岩和变质基性岩形成时代及意义(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第39卷
期数:
2017年第02期
页码:
143-160
栏目:
基础地质与矿产地质
出版日期:
2017-03-15

文章信息/Info

Title:
Paleoproterozoic Granites and Meta-mafic Rocks from Yingkou-Liaoyang Area of the Eastern Liaoning and Their Significance
文章编号:
1672-6561(2017)02-0143-18
作者:
李超; 孙克克; 陈斌
1.北京大学 地球与空间科学学院，北京 100871； 2.合肥工业大学 资源与环境工程学院，安徽 合肥 230009
Author(s):
LI Chao;  SUN Ke-ke;  CHEN Bin
1. School of Earth and Space Sciences, Peking University, Beijing 100871, China; 2. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
关键词:
花岗岩; 基性岩; 古元古代; 锆石U-Pb年龄; 地球化学; 弧后盆地; 胶辽吉带; 华北克拉通
Keywords:
granite;  mafic rock;  Paleoproterozoic;  zircon U-Pb age;  geochemistry;  back-arc basin;  Jiao-Liao-Ji Belt;  North China Craton
分类号:
P588.12
DOI:
-
文献标志码:
A
摘要:
辽东地区保存有较为完好的古元古代地质记录。对位于辽东营口—辽阳地区古元古代花岗岩(建一花岗岩)和变质基性岩(隆昌变质辉绿岩和蒜盘峪变质辉长岩)进行了锆石U-Pb定年、地球化学和岩石成因学研究。结果表明：建一花岗岩形成于(2 322±18)Ma，隆昌变质辉绿岩形成于(2 335±21)Ma，蒜盘峪变质辉长岩形成于(2 353±22)Ma；建一花岗岩源自太古宙古老地壳部分熔融，属于准铝质钙碱性I型花岗岩，富集Rb、Ba、U等大离子亲石元素，亏损Nb、Ta、Zr、Hf等高场强元素，具有俯冲带岩浆特征；隆昌变质辉绿岩和蒜盘峪变质辉长岩均具有富集型洋中脊玄武岩(E-MORB)特点，并显示岛弧地球化学特征；隆昌变质辉绿岩源自新太古代富集程度不高的地幔部分熔融，并在上升过程中受到年轻地壳的改造，蒜盘峪变质辉长岩是古太古代—中太古代富集地幔部分熔融的产物；古元古代早期，辽吉地区处于大陆弧后盆地构造环境，弧后伸展作用导致大陆岩石圈部分熔融产生花岗岩和基性岩，在后期的地体拼贴过程中，两者遭受到不同程度的变质变形，进而形成了条痕状花岗岩和变质基性岩。
Abstract:
Paleoproterozoic geological records are well preserved in the eastern Liaoning. The zircon U-Pb dating, geochemical and petrogenesis of Paleoproterozoic granites (Jianyi granite) and meta-mafic rocks (Longchang meta-diabase and Suanpanyu meta-gabbro) in Yingkou-Liaoyang area of the eastern Liaoning were studied. The results show that LA-ICP-MS zircon U-Pb ages of Jianyi granite, Longchang meta-diabase and Suanpanyu meta-gabbro are (2 322±18), (2 335±21), (2 353±22)Ma, respectively; Jianyi Granite forms from partial melting of Archean crust, and belongs to metaluminous-calcalkaline I-type granite, and is enriched in large ion lithophile element (LILE), and is depleted in high field strength element (HFSE), showing the characteristics of magma in subduction zones; Longchang meta-diabase and Suanpanyu meta-gabbro belong to enriched mid-ocean ridge basalts (E-MORB) and have the geochemical characteristics of island arc; Longchang meta-diabase is generated from partial melting of Neoarchean mantle which is not very enriched, and the diabase is contaminated by juvenile crust during upwelling; Suanpanyu meta-gabbro is produced from partial melting of Paleoarchean-Mesoarchean enriched mantle; Liaoning-Jilin region is a continental back-arc basin in Early Paleoproterozoic, and the strong extension in the back-arc region results in partial melting of continental lithosphere, which generates the granites and meta-mafic rocks; these rocks are later metamorphosed, deformed and pushed together in later processes of terrane amalgamation.

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备注/Memo

备注/Memo:
收稿日期:2017-02-07
基金项目:国家重点基础研究发展计划(“九七三”计划)项目(2012CB416603)
作者简介:李 超(1987-),男,黑龙江齐齐哈尔人,理学博士研究生,E-mail:lichaocug@qq.com。
通讯作者:陈 斌(1964-),男,安徽全椒人,教授,博士研究生导师,理学博士,E-mail:binchen@pku.edu.cn。
更新日期/Last Update: 2017-03-31